diff --git a/example/lambdas.dart b/example/lambdas.dart
index c8ffd92..b7a9ff2 100644
--- a/example/lambdas.dart
+++ b/example/lambdas.dart
@@ -2,7 +2,7 @@
 
 main() {
   var t = new Template('{{ foo }}');
-  var lambda = (_) => 'bar';
+  Function lambda = (_) => 'bar';
   var output = t.renderString({'foo': lambda}); // bar
   print(output);